拉垫式夹紧机构结构简单，夹紧可靠，刀片部分刚性较好。
参考答案：错
We must __________ a topic before we start to write. [ ]
A. decide between
B. decide to
C. decide on
D. decide against
汉唐时代，泄泻称为：
A．肠
B．滞下
C．下利
D．下痢
E．以上都不是
